linux-kernel - Re: [PATCH] Fix memory leak in dlm_add_member() when dlm_node

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Date:	Thu, 19 Jul 2007 16:48:28 +0100
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	Jesper Juhl <jesper.juhl@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Teigland <teigland@...hat.com>
Subject: Re: [PATCH] Fix memory leak in dlm_add_member() when
	dlm_node_weight() returns less than zero

Hi,

Now in the GFS2 git tree. Thanks,

Steve.

On Thu, 2007-07-19 at 00:27 +0200, Jesper Juhl wrote:
> Greetings,
> 
> There's a memory leak in fs/dlm/member.c::dlm_add_member().
> 
> If "dlm_node_weight(ls->ls_name, nodeid)" returns < 0, then 
> we'll return without freeing the memory allocated to the (at 
> that point yet unused) 'memb'.
> This patch frees the allocated memory in that case and thus 
> avoids the leak.
> 
> 
> Signed-off-by: Jesper Juhl <jesper.juhl@...il.com>
> ---
> 
>  fs/dlm/member.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/dlm/member.c b/fs/dlm/member.c
> index 073599d..d099775 100644
> --- a/fs/dlm/member.c
> +++ b/fs/dlm/member.c
> @@ -56,8 +56,10 @@ static int dlm_add_member(struct dlm_ls *ls, int nodeid)
>  		return -ENOMEM;
>  
>  	w = dlm_node_weight(ls->ls_name, nodeid);
> -	if (w < 0)
> +	if (w < 0) {
> +		kfree(memb);
>  		return w;
> +	}
>  
>  	memb->nodeid = nodeid;
>  	memb->weight = w;
> 

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